build(bake): add targets description

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

content/build/bake/targets.md

@@ -0,0 +1,95 @@
+---
+title: Bake targets
+description: Learn how to define and use targets in Bake
+keywords: bake, target, targets, buildx, docker, buildkit, default
+---
+
+A target in a Bake file represents a build invocation. It holds all the
+information you would normally pass to a `docker build` command using flags.
+
+```hcl
+target "webapp" {
+  dockerfile = "webapp.Dockerfile"
+  tags = ["docker.io/username/webapp:latest"]
+  context = "https://github.com/username/webapp"
+}
+```
+
+To build a target with Bake, pass name of the target to the `bake` command.
+
+```console
+$ docker buildx bake webapp
+```
+
+You can build multiple targets at once by passing multiple target names to the
+`bake` command.
+
+```console
+$ docker buildx bake webapp api tests
+```
+
+## Default target
+
+If you don't specify a target when running `docker buildx bake`, Bake will
+build the target named `default`.
+
+```hcl
+target "default" {
+  dockerfile = "webapp.Dockerfile"
+  tags = ["docker.io/username/webapp:latest"]
+  context = "https://github.com/username/webapp"
+}
+```
+
+To build this target, run `docker buildx bake` without any arguments:
+
+```console
+$ docker buildx bake
+```
+
+## Target properties
+
+The properties you can set for a target closely resemble the CLI flags for
+`docker build`, with a few additional properties that are specific to Bake.
+
+For all the properties you can set for a target, see the [Bake reference](/build/bake/reference#target).
+
+## Grouping targets
+
+You can group targets together using the `group` block. This is useful when you
+want to build multiple targets at once.
+
+```hcl
+group "all" {
+  targets = ["webapp", "api", "tests"]
+}
+
+target "webapp" {
+  dockerfile = "webapp.Dockerfile"
+  tags = ["docker.io/username/webapp:latest"]
+  context = "https://github.com/username/webapp"
+}
+
+target "api" {
+  dockerfile = "api.Dockerfile"
+  tags = ["docker.io/username/api:latest"]
+  context = "https://github.com/username/api"
+}
+
+target "tests" {
+  dockerfile = "tests.Dockerfile"
+  contexts = {
+    webapp = "target:webapp",
+    api = "target:api",
+  }
+  output = ["type=local,dest=build/tests"]
+  context = "."
+}
+```
+
+To build all the targets in a group, pass the name of the group to the `bake`
+command.
+
+```console
+$ docker buildx bake all
+```

data/toc.yaml

@@ -1953,6 +1953,8 @@ Manuals:
           title: Overview
         - path: /build/bake/introduction/
           title: Introduction
+        - path: /build/bake/targets/
+          title: Targets
         - path: /build/bake/reference/
           title: Bake file reference
         - path: /build/bake/configuring-build/